150 IBM eServer zSeries 900 Technical Guide
IC-3 channel paths can be used to connect a Coupling Facility LPAR (using definition type
ICP) to an ESA/390 LPAR (using definition type ICP) on the same CPC. The z/Architecture or
ESA/390 architecture LPARs using ICP can also use CFP, CBP, and/or CBS-defined channels
at the same time to connect to Coupling Facility LPARs on another server.
On earlier generation servers, ISC or ICB channels could be used to connect a Coupling
Facility LPAR to an ESA/390 LPAR on the same server. This was referred to as
Self Coupled.
This is still possible on the z900 server, but is not recommended. We recommend using IC-3
Coupling channels when connecting a Coupling Facility LPAR to other operating system
LPARs on the same z900 server.
3.9.1 Connectivity
Following are Coupling channel connectivity options in the Parallel Sysplex environment.
z900 Coupling channel features
z900 supports the following Coupling channel features:
򐂰 Inter-System Channel-3, ISC-3 (Peer and Compatibility modes: feature codes 0217, 0218,
and 0219)
򐂰 Integrated Cluster Bus-3, ICB-3 (Peer mode: feature code 0993)
򐂰 Integrated Cluster Bus, ICB (Compatibility mode: feature code 0992)
򐂰 Internal Channel-3, IC-3 (Peer mode: no feature code, Licensed Internal Code (LIC)
function defined via HCD/IOCP)
ISC-3 Coupling channel
The z900 ISC-3 feature is made up of the following feature codes:
򐂰 ISC-3 Mother Card (feature code 0217)
򐂰 ISC-3 Daughter Card (feature code 0218)
򐂰 ISC-3 Port (feature code 0219)
Figure 3-33 on page 151 shows connectivity options for ISC-3 channels.
Chapter 3. Connectivity 151
Figure 3-33 z900 ISC-3 connectivity options
The z900 ISC-3 mother card occupies one slot in the z900 zSeries I/O cage. The ISC-3
mother card supports up to two ISC-3 daughter cards. Each ISC-3 daughter card has two
independent ports with one CHPID associated with each active port. The ISC-3 ports are
activated via Licensed Internal Code Configuration Control.
The ISC-3 mother and daughter card feature codes cannot be ordered. Instead, the quantity
of ISC-3 Port features ordered determines the appropriate number of ISC-3 mother and
daughter cards included in the configuration.
Each active ISC-3 port supports connection to a 2 Gbps (ISC-3 Peer mode) or 1Gbps (ISC-3
Compatibility mode) Coupling link via 9 micron single mode fiber optic cable terminated with
an LC-Duplex connector.
ISC features on G5/G6 and earlier servers have Fiber Optic Sub Assemblies (FOSA) that
support SC-Duplex cable connectors. These existing single mode HiPerlink cables can be
reused by attaching a single mode fiber LC-Duplex to SC-Duplex conversion cable. This is a
2 m cable that is connected between the z900 server ISC-3 port and the existing HiPerlink
cable from the G5/G6 server.
Existing SC-Duplex 50 micron multimode fiber cable infrastructure may be reused with the
z900 ISC-3 port features in Compatibility mode (1 Gbps) only. The use of these multimode
cable types requires a mode conditioner patch (MCP) cable to be used at each end of the
fiber link. Use of the single-mode to multimode MCP cables reduces the supported optical
distance of the link to 550 meters.
z900
LP1 LP2 LP3
CHPID type CFP CFP CFS CFS
Data rate 2Gb 2Gb 1Gb 1Gb
Cabling req***
Sm
fiber
Sm
fiber
Sm
fiberr
Sm
fiber
I/O card used YES YES YES YES
feature code
0218/
0219
0218/
0219
0218/
0219
0218/
0219
feature name ISC-3 ISC-3 ISC-3 ISC-3
STI connection STI-M STI-M STI-M STI-M
CF01
STI connection STI-M STI-M
Feature name ISC-3 ISC-3
Feature code
0218/
0219
0218/
0219
I/O card used YES YES
Cabling req
Sm
fiber
Sm
fiber
Data rate 2Gb 2Gb
CHPID definition CFP CFP
CF02
STI connection ** **
Feature name ISC ISC
Feature code 008 008
I/O card used YES YES
Cabling req
Sm
fiber
Sm
fiber
Data rate 1Gb 1Gb
CHPID definition CFR CFR
Sm Fiber max distance *10 km
LC connector ends at 2064
z900
SC to LC duplex 2 m cable adapter
(single-mode) P/N 05N4808
CHPIDs defined as
CFP runs in
peer mode
CFS/CFR runs in
compatibility mode
* Max distance with RPQ
20 km
(requires new H/W)
Reuse of existing HiPerlink
single-mode cabling
100
** STI connection thru
FIBB and ISC mother
card on G5/G6
***Multimode cabling may
be rused; requires MCP
cables and distance
restricted to 550 m.
9672
R06
ISC-3 operates in peer or
compatibility mode

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